Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Electrical & Electronics Expert

1) describe the data needed for estimating the regulation of alternator by the potier method. Describe how regulation is determined for different power factor.

2) Determine the synchronous impedance and reactance of an alternator where the given field current generates an armature current of 200 A on short circuit and a generated E.M.F of 50 V on open circuit. The armature resistance is 0.1 ohm. To what induced voltage should the alternator be excited if it is to deliver the load of 100 A at a pf of 0.8 lagging, with a terminal voltage of 200 V.

3) Describe the effect of varying the excitation upon the armature current and power factor of the synchronous motor for a constant output with the help of phasor diagram.

4) a) A 500, 1 Phase synchronous motor provides a net output mechanical power of 7.46 KW and operates at the 0.9 pf lagging. Its effective resistance is 0.8 ohm. If iron and friction losses are 500 W and excitation losses are 800 W, determine the armature current. Find the commercial efficiency.

b) A 75 KW,3 phase star connected ,50 Hz , 440v cylindrical rotor synchronous motor operates at rated condition with 0.8 pf leading. The motor efficiency excluding field and stator losses, is 95% and Xs =2.5 ohm. Find:

i) Mechanical power developed

ii) Armature current

iii) Back e.m.f

iv) Power angle

v) Maximum or pull out torque of the motor.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M913269

Have any Question? 


Related Questions in Electrical & Electronics

1 what is the total distance around the circumference of a

1. What is the total distance around the circumference of a circle of radius 1 m? What is the total vector distance around the circle? 2. What is the total surface area of a cube of sides 1 m? Assuming the normals to the ...

1 does sip need to use the service of rtp explain2 we

1. Does SIP need to use the service of RTP? Explain. 2. We mentioned that SIP is an application-layer program used to provide a signaling mechanism between the caller and the callee. Which party in this communication is ...

A line assumed to be infinitely long and of unknown

A line assumed to be infinitely long and of unknown characteristic impedance is connected to a line of characteristic impedance on which standing wave measurements are made. It is found that the standing wave ratio is 3 ...

Your client wants a quick design for a system to pump on

Your client wants a quick design for a system to pump on the order of 1800 gallons per day from a depth of 200 ft. You decide to use a 45-V submersible pump with an estimated efficiency of 35% along with PV modules havin ...

1 are encoding and decoding of the multimedia data done by

1. Are encoding and decoding of the multimedia data done by RTP? Explain. 2. Assume an image is sent from the source to the destination using 10 RTP packets. Can the first five packets define the encoding as JPEG and the ...

The relationship between deformed and undeformed

The relationship between deformed and undeformed coordinates for the pure bending of a plane-strain solid is given as Compare the engineering strain and Lagrangian strain. Show that the two strain measures become identic ...

The pressure rise across a pump p this term is proportional

The pressure rise across a pump P (this term is proportional to the head developed by the pump) may be considered to be affected by the fluid density ρ, the angular velocity ω, the impeller diameter D, the volumetric rat ...

1 consider a router that receives packets from three

1. Consider a router that receives packets from three different sources of traffic, each ranked in order of priorities (source 1 has highest priority -class 1, source 2 has class 2 priority and finally source 3 has lowes ...

1 what is a poynting vector what is its physical

1. What is a Poynting vector? What is its physical significance? 2. What is the physical interpretation of the surface integral of the Poynting vector over a closed surface? 3. Discuss how the fields far from a physical ...

Suppose a pv module has the 1-sun i-v curve shown below

Suppose a PV module has the 1-sun I-V curve shown below. Within the module itself, the manufacturer has provided a pair of bypass diodes to help the panel deliver some power even when many of the cells are shaded. Each d ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro